package containers;

//: containers/Maps.java
// Things you can do with Maps.
import static net.mindview.util.Print.print;
import static net.mindview.util.Print.printnb;

import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TreeMap;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;

import net.mindview.util.CountingMapData;

public class Maps {
	public static void printKeys(Map<Integer, String> map) {
		printnb("Size = " + map.size() + ", ");
		printnb("Keys: ");
		print(map.keySet()); // Produce a Set of the keys
	}

	public static void test(Map<Integer, String> map) {
		print(map.getClass().getSimpleName());
		map.putAll(new CountingMapData(25));
		// Map has 'Set' behavior for keys:
		map.putAll(new CountingMapData(25));
		printKeys(map);
		// Producing a Collection of the values:
		printnb("Values: ");
		print(map.values());
		print(map);
		print("map.containsKey(11): " + map.containsKey(11));
		print("map.get(11): " + map.get(11));
		print("map.containsValue(\"F0\"): " + map.containsValue("F0"));
		Integer key = map.keySet().iterator().next();
		print("First key in map: " + key);
		map.remove(key);
		printKeys(map);
		map.clear();
		print("map.isEmpty(): " + map.isEmpty());
		map.putAll(new CountingMapData(25));
		// Operations on the Set change the Map:
		map.keySet().removeAll(map.keySet());
		print("map.isEmpty(): " + map.isEmpty());
	}

	public static void main(String[] args) {
		test(new HashMap<Integer, String>());
		test(new TreeMap<Integer, String>()); //정렬이 보증된다
		test(new LinkedHashMap<Integer, String>()); //들어가는 순서가 보증된다.
		test(new IdentityHashMap<Integer, String>());
		test(new ConcurrentHashMap<Integer, String>());
		test(new WeakHashMap<Integer, String>());
	}
} /* Output:
HashMap
Size = 25, Keys: [15, 8, 23, 16, 7, 22, 9, 21, 6, 1, 14, 24, 4, 19, 11, 18, 3, 12, 17, 2, 13, 20, 10, 5, 0]
Values: [P0, I0, X0, Q0, H0, W0, J0, V0, G0, B0, O0, Y0, E0, T0, L0, S0, D0, M0, R0, C0, N0, U0, K0, F0, A0]
{15=P0, 8=I0, 23=X0, 16=Q0, 7=H0, 22=W0, 9=J0, 21=V0, 6=G0, 1=B0, 14=O0, 24=Y0, 4=E0, 19=T0, 11=L0, 18=S0, 3=D0, 12=M0, 17=R0, 2=C0, 13=N0, 20=U0, 10=K0, 5=F0, 0=A0}
map.containsKey(11): true
map.get(11): L0
map.containsValue("F0"): true
First key in map: 15
Size = 24, Keys: [8, 23, 16, 7, 22, 9, 21, 6, 1, 14, 24, 4, 19, 11, 18, 3, 12, 17, 2, 13, 20, 10, 5, 0]
map.isEmpty(): true
map.isEmpty(): true
...
*///:~
